:root{font-family:system-ui,-apple-system,"Microsoft YaHei",sans-serif;color:#1c2935;background:#f4f7f8}*{box-sizing:border-box}body{margin:0}.hidden{display:none!important}button,input,textarea{font:inherit}button{cursor:pointer;border:0;border-radius:8px;padding:10px 14px;background:#126d6a;color:#fff}button:disabled{opacity:.55;cursor:not-allowed}input,textarea{border:1px solid #c8d3d6;border-radius:8px;padding:10px;width:100%;background:#fff;color:#1c2935}label{font-size:.9rem}p{color:#536873}.login{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(420px,100%);background:#fff;border:1px solid #dce6e6;border-radius:16px;padding:30px;box-shadow:0 14px 40px #203e3d12}.login-card h1{margin-top:0}.login-card label,.login-card input{display:block;margin:12px 0}.login-card button{width:100%;margin-top:12px}.layout{display:grid;grid-template-columns:260px 1fr;min-height:100vh}aside{background:#173b3b;color:#fff;padding:18px;display:flex;flex-direction:column;gap:14px}.brand{font-weight:700;font-size:1.1rem}.chat-list{display:flex;flex:1;flex-direction:column;gap:5px}.chat-list button{text-align:left;background:transparent;color:#d6ece9;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-list button.active{background:#28605d}.account{display:grid;gap:8px;font-size:.8rem;overflow-wrap:anywhere}.account button{background:#285c59}.conversation{display:flex;flex-direction:column;height:100vh;min-width:0}header{display:flex;align-items:center;justify-content:space-between;padding:18px 24px;border-bottom:1px solid #dbe4e4;background:#fff;font-weight:700}.sub{color:#6b8083;font-size:.8rem;font-weight:400}.messages{flex:1;overflow:auto;padding:24px;display:flex;flex-direction:column;gap:18px}.message{white-space:pre-wrap;overflow-wrap:anywhere;max-width:900px;line-height:1.65;border-radius:12px;padding:14px 16px;background:#fff;border:1px solid #e0e9e9}.message.user{align-self:flex-end;background:#e0f3ef}.message img{display:block;max-width:min(360px,100%);max-height:260px;margin-top:8px}.empty{margin:auto;color:#7d9195}.composer{padding:16px 24px 20px;background:#fff;border-top:1px solid #dbe4e4}.composer textarea{resize:vertical;min-height:70px}.compose-actions{display:flex;align-items:center;gap:12px;margin-top:8px}.compose-actions button{margin-left:auto}.upload{cursor:pointer;color:#126d6a}.upload input{display:none}#fileName{font-size:.8rem;color:#5e7072}#status,#loginError,#passwordError{font-size:.85rem;color:#9a3a37;min-height:1em;margin:6px 0}dialog{border:0;border-radius:12px;padding:24px;max-width:min(400px,90vw);box-shadow:0 20px 70px #0004}dialog::backdrop{background:#0007}dialog input,dialog label{display:block;margin:10px 0}.dialog-actions{display:flex;gap:8px;justify-content:flex-end}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(max-width:700px){.layout{grid-template-columns:1fr}aside{min-height:auto}.chat-list{max-height:130px;overflow:auto}.account{display:flex;align-items:center;flex-wrap:wrap}.conversation{height:70vh}.messages{padding:12px}.composer{padding:12px}}

select{font:inherit;width:100%;padding:10px;border:1px solid #c8d3d6;border-radius:8px;background:#fff} .setting-help{font-size:.8rem;line-height:1.45} dialog label.checkbox{display:flex;align-items:center;gap:8px} dialog label.checkbox input{width:auto;margin:0} #settingsError{color:#9a3a37}